Indo is used for a small, uncommon, subset of cluster. If it was going to be effective, it would be showing benefit by now.

Le me suggest that you print out these lists of current treatments for cluster, use in a talk with your doctor as a tool to plan treatment. My intuition says you may not be seeing someone with sufficient skill in this area.
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HERE ARE TWO MAJOR DOCUMENTS WITH RECOMMENDED TREATMENTS FOR CLUSTER HEADACHE, ONE FROM A U.S. PHYSICIAN, THE SECOND FROM EUROPE.
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START PRINTPAGEMultimedia File Viewing and Clickable Links are available for Registered Members only!!  You need to or END PRINTPAGE
Here is a link to read and print and take to your doctor.  It describes preventive, transitional, abortive and surgical treatments for CH. Written by one of the better headache docs in the U.S.  (2002. Rozen)
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Treatment guidelines from Europe

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A. May, M. Leone, J. Áfra, M. Linde, P. S. Sándor, S. Evers, P. J. Goadsby:
EFNS guidelines on the treatment of cluster headache and other
trigeminalautonomic cephalalgias.
European Journal of Neurology. 2006; 13: 1066–1077.

Download free full text:
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(Thanks to "cluster" for link.)

If your doc is open to you, print the entire article and give to her. Good for you too.
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Cluster headache.
From: START PRINTPAGEMultimedia File Viewing and Clickable Links are available for Registered Members only!!  You need to or END PRINTPAGE (Orphanet Journal of Rare Diseases)
[Easy to read; one of the better overview articles I've seen. Suggest printing the full length article if you are serious about keeping a good medical library on the subject.]

Leroux E, Ducros A.

ABSTRACT: Cluster headache (CH) is a primary headache disease characterized by recurrent short-lasting attacks (15 to 180 minutes) of excruciating unilateral periorbital pain accompanied by ipsilateral autonomic signs (lacrimation, nasal congestion, ptosis, miosis, lid edema, redness of the eye). It affects young adults, predominantly males. Prevalence is estimated at 0.5-1.0/1,000. CH has a circannual and circadian periodicity, attacks being clustered (hence the name) in bouts that can occur during specific months of the year. ALCOHOL IS THE ONLY DIETARY TRIGGER OF CH, STRONG ODORS (MAINLY SOLVENTS AND CIGARETTE SMOKE) AND NAPPING MAY ALSO TRIGGER CH ATTACKS. During bouts, attacks may happen at precise hours, especially during the night. During the attacks, patients tend to be restless. CH may be episodic or chronic, depending on the presence of remission periods. CH IS ASSOCIATED WITH TRIGEMINOVASCULAR ACTIVATION AND NEUROENDOCRINE AND VEGETATIVE DISTURBANCES, HOWEVER, THE PRECISE CAUSATIVE MECHANISMS REMAIN UNKNOWN. Involvement of the hypothalamus (a structure regulating endocrine function and sleep-wake rhythms) has been confirmed, explaining, at least in part, the cyclic aspects of CH. The disease is familial in about 10% of cases. Genetic factors play a role in CH susceptibility, and a causative role has been suggested for the hypocretin receptor gene. Diagnosis is clinical. Differential diagnoses include other primary headache diseases such as migraine, paroxysmal hemicrania and SUNCT syndrome. At present, there is no curative treatment. There are efficient treatments to shorten the painful attacks (acute treatments) and to reduce the number of daily attacks (prophylactic treatments). Acute treatment is based on subcutaneous administration of sumatriptan and high-flow oxygen. Verapamil, lithium, methysergide, prednisone, greater occipital nerve blocks and topiramate may be used for prophylaxis. In refractory cases, deep-brain stimulation of the hypothalamus and greater occipital nerve stimulators have been tried in experimental settings.THE DISEASE COURSE OVER A LIFETIME IS UNPREDICTABLE. Some patients have only one period of attacks, while in others the disease evolves from episodic to chronic form.

PMID: 18651939 [PubMed]

As I mnetioned in an earlier post, you have the perfect "can do" attitude to whip this thing! ;)

Joe

That's fantastic news! [smiley=sayyes.gif] Hoping the road just keeps getting better for you, I love it when everything works the way it's supposed to! ;)
 (Don't you just love that Batch guy?)
Joe