So now she wants me to see a psychiatrist and get medication...She finally said, "It's not what you do, its what you say, you say bizarre things, so you must be sick. Even though you act happy, I know you are not....Please, I am begging you, go to the doctor. I will take you."
I think a counsellor would be good...for you and for her. To work out what the real issues are. You first. Check out local resources in your area, and find someone who fits well. Talk about the pain of losing your entire social network in one fell swoop. Brainstorm how you can adapt and overcome. Then you can genuinely tell your sister you looked for help and got some. And if she brings it up again, invite her to come along to a meeting with your counsellor.
She said "Everyone says that something is wrong with you." I said, "Who is everyone?" She said, "Well, I don't want to give names, but look at the way you are acting."..., she insinuates that my friends will leave me if I keep talking like this, and that I am unhappy.
Right off, it is manipulative and wrong to reinforce an opinion by bringing in the anonymous "we". Teach your sister to talk to you properly. It is OK to talk about her anger and frustration, her fears for you and so on. But tell her point blank you don't want to hear about anyone else's opinion. If they have a backbone they can talk to you themselves. Tell her it's a matter of integrity and honesty.
...was so upset, ...anger and frustration...trying to punish me somehow...they have been so angry with me.. I can feel their frustration...Its so weird to see them act like this.
I think this is a little backlash from your first honest conversations with them. JW's can't handle any negative emotional feedback. Immediately you grow horns and a tail. It takes a while to climb back from that. Just respond calmly and consistently. I've seen Blondie in fine form, and it is amazing how cutting she can be while speaking simple bible truth - which they should know. Keep your demeanor mild, your voice calm, and it's amazing what a JW will take in.