I'm not sure what I'd do, Citalopram is cheap and has a low side effect burden, though I seem to remember that I had a lot of migranes when taking it. However, if it has pooped, it won't magically start working again. I've no experience of Wellbutrin, is there a cheaper generic available? Double check any interactions, because I've noticed a lot of anti-depressants contra-indicate certain migraine meds, you should be able to check that out online but your medical docs opinion is worth hearing on that one too. I have a vague memory that certain anti-depressants can be used to treat migraine, but for the life of me I can't remember which ones, or even if it was just something that I imagined. Again, that is something that you can check out online.

Aside from whether you have the funds to pay for expensive meds in the long term, do you actually have the funds to pay for the short-term supply right now? If you don't or if financial stress is a significant trigger for you then I'd say it probaly isn't worth giving yourself the extra stress. However, if you have the money, get the migranes treated, you know the drug will work and once you've got them back under control there is every chance you won't need that med in the longer term. Anti-depressants are a long-term med, so finding one that is both effective and affordable has to be a priority. Hopefully, your medical doc can refer you to a cheaper psychiatric service.

BTW, Prescription meds is something the NHS does get more or less right. I go to my GP, he writes a 'script, I take it to the pharmacy and pay £8.05 and I get my meds. The true cost may be much more (or much less) but all I pay is £8.05, each different med on the 'script incurrs a charge, but if I need more than three items I can buy a prepayment certificate for £30, this lasts three months and covers me for an unlimited number of items. Just thought I'd share something good, because I'm usually moaning.