Wait, let's back up here. Were you suffering mental illness before being put on Celexa, or just pain? It's also not a good idea to use drugs for mental illness with a regular doc -- anyone who's ever researched them or taken them knows they can cause muscle pain and spasms. With a little more research anyone can learn one of the reasons they do this is they can interfere with the absorption of magnesium, and because serotonin, which they alter the body's use of, is involved in relaxing muscles and nerves. As for withdrawal, it's very unlikely you would have that after such a short time on them, but these drugs are so individual in how they affect people anything is possible. The way to find out is, go back on the drug at the last dose at which you felt fine. If these new symptoms go away, then you know it's the cause, and taper off more slowly until you successfully quit the drug, which should be easy considering your short duration on it. As for Cymbalta, it is used for pain relief in people with chronic long-term pain that cannot be diagnosed or treated properly, as with fibromyalgia, but if you think Celexa is hard to quit, well, don't read about Cymbalta. But these kinds of meds don't treat whatever is causing your pain, they make you not care about it so much. If you haven't exhausted every resource for finding out why you have headaches and body aches, including specialists and massage and chiropractors or osteopaths and acupuncture and changing how you're exercising etc. it's not time to give up and go on drugs that suppress rather than treat pain. Also, Celexa and its close cousin Lexapro are well known for causing head pressure and other odd pressures, so it's an odd choice for a headache sufferer. Have you ever tried meditation? Got rid of my migraines. At any rate, hope this helps you think this out. And I think you need a new doctor.
Oh, and I should note the timeframe- Celexa was prescribed mid December 2016. I went off it in mid January 2017. It's obviously early March now.