Hi there ~
Your symptoms are most likely due to exacerbation of depression
rather than going off of prozac. I think your being lightheaded, dizzy, nauseous and having chest pain
are indications of having had inadequate treatment response to medication. Motrin and another NSAID may help with symptomatic relief, however you need to consult a psychiatrist
to get help with other medications. Also therapy or counseling will be helpful in these situations.
I hope this helps. Take care.