I used to be a cocaine addict, about a year of snorting it (around a ball a week). At first it was all good, euphoric, social fun, but eventually I'd be doing it alone at home. To me this was the first indicator that it was becoming an addiction. As time went on the positive effects began to be outweighed by negative effects, similar to what has happened to you. Eventually I did an out patient rehab program and got clean.
Then about three years later, I had a girl friend and we began dealing cocaine and it had been so long since I had a problem with it that I didn't think of how it will end up. Well now instead of snorting it, we were i.v.ing it, a lot of it. Around an ounce a week. Our tolerance got so high that we were doing shots that were over half a gram each. This went on for about half a year, and the same thing happened as before. It was nothing but dysphoria and unwanted effect when we did it. This time although I didn't go to rehab, I just dropped the addiction.
So if I were you I'd consider going to a rehab facility or outpatient program. Doing more crack won't have any good effects, it's just gonna feel worse and worse,