I am not a doctor, so please understand that any suggestions I make, you should run them by your physician first. You could start off on the Celexa at 5 mg for a week. At that point, increase it to 10 mg, also for a week. When 15 mg for a week, and finally 20 mg. Please keep these factors in mind... When you start an anti-depressant, and each time you increase the dose of one, you may see some side effects, although some individuals don't have any. When starting an anti-depressant, initial side effects usually last some two weeks. When one goes up on the dose, side effects are usually more short lived.
Also, 20 mg is the lowest therapeutic dose for Celexa. So, when you finally reach 20 mg, you should consider that to be the starting point of your medication therapy.
You mentioned cutting your leg off, not literally, but we will use your leg as an analogy. Lets say that you broke your leg. You know that if a doctor gives you a pill for the pain, that pill is not going to do anything to fix your broken leg. Only time is going to do that. Anti-depressants are like putting a cast on your damaged brain. They take time to work, usually 3 to 12 weeks (once you are on a therapeutic dose-20 mg for Celexa). What you will see is degrees of improvement.
I started on 20 mg of Celexa, because I didn't know better at the time to start at a lower dose, as I am suggesting you do. I had some pretty bad side effects, but the side effects aren't going to kill you, or anyone. On day 16-17, my side effects suddenly disappeared by like 90%. After some three weeks on the 20 mg, my depression and intrusive thoughts began to clear. At six weeks, I began to see improvement in my anxiety. During treatment, it is not unusual to have a few good days, followed by some not so good days. This is very normal with some individuals.
If I can be of any further help, let me know.
The very best to you, Chris!... Chuck