I'm taking 20mg of Fluoxetine and haven't noticed any swelling. Sorry to hear that. You should consult your doctor but it shouldn't be hard at all to get off of. It stays in your system I've heard for several days. Paxil (which I haven't taken) is supposedly very had to get off.
In my case, it's definitely not masking the problem. I have an extremely over active brain, or I should say, the wrong parts of my brain are active! It sounds like your case is different.
P.S I have OCD. You didn't specify your ailment.