First of all, please know that you are not alone. Second, I hate to tell you this, but you might not have anything seriously wrong. I have had migraines for 30 years and I used to wish I had a brain tumor. No such luck, just migraines, which are now complicated by herniated discs in my neck. That said, I know of several people with migraine that did end up having an aneurysm or tumor.
I have daily headaches, and once a week or so I get a disabling headache. Despite this, I have raised 2 children and worked all these years. I have tried so many different things. A few things that have helped:
1) Taking the birth control pill Yasmin (now called Yaz) continuously so I do not have a period. This can be done safely for years and helps even out the hormones. All other BCPs make migraines worse.
2) Massage therapy helps - I have a lot of neck/shoulder pain.
3) I take 3 meds, Claritin (over-the counter here) - it is the newer antihistimine drug. I have been told NOT to take decongestants, so I am not sure about the pseudoephdrine your dr prescribed.
Singulair - for asthma, but it helps migraines also. Norvasc - for blood pressure normally, but it was prescribed for the migraines and if I run out of it, they get worse.
4) The triptans work for me about 75% of the time as an abortive, but lately, they are not working so well
Finally, I think you should consider opiates. My doc explained that they should be taken daily, not just when you get a migraine, this prevents forming an addiction.
Even after all this, I had a really bad day today and have been nearly suicidal. I have an appt with a new doctor next week, like you, I don't expect much.
Good luck, and take care of yourself.