Hi Jasmine
First of all, I'm very glad things are going better.
Now, I know I'm a latecomer in this thread but I wanted to make a few observations, and offer what I can....
To begin with, I'd like to kind of back up what Gerry said.... Personally, I seriously doubt any Pastor who'd give up on someone (you said he didn't ask how you were anymore and he seemed not to care). Jesus gave us a model for those in leadership, and it included a Shepherd who'd leave 99 sheep to find the one that was in distress. I'd also question the message about God not using "dirty vessels"...... any vessel in the Master's hands (and you are) is clean.
Also..... I really don't believe it matters if you were involved in the Occult, or prayed to Satan before you were saved. Because scripture says you're not that person anymore and all that's passed. Anything less would imply that some piddly nobody demon could resist the power of Christ, which we know isn't true. He defeated those powers, mocking them publically (Colosians 2:15). Whoever it was that did whatever you did, she's dead now. I'd submit that what Satan and his kin want is for you to dwell on the past in guilt rather than see who you are now.
Second, I'd like to agree with those who've suggested that this may not be entirely demonic. Now, you said you'd be to a psychiatrist or therapist who said you were fine.... well, I can't pretend to know how you deal with him/her, but I get the feeling you're not telling your doctor what you're telling us. A psychiatrist or therapist can only help to the extent that we're honest with them.
Now, you said you know this isn't a physical problem, but spiritual, because when you ask Jesus for help. Well, think of it this way; I get migraine headaches, not all the time but more than most people. If I pray for the Lord to lessen or take away a headache and it vanishes, that doesn't mean my problem was spiritual. I think you really need to consider the possibility of a physical component here, because I'd hate to think of you being miserable and beating yourself up in guilt over something that turned out to be a biochemical problem. You wouldn't be ashamed to go to the doctor for, say, diabetes. Don't be afraid to pursue this.
In any case, I'll be praying for you Jasmine. God bless
-Elias