It is possible that you haven't reached the appropriate dose yet. Since you have only been on it for four months, I think an increase of the dose is probably needed. Especially if you felt good for awhile. That was probably a taste of what it is going to be like when you reach the right dose for you. I would talk to the doctor and let them know that you were feeling good, but you aren't now. I am sure they will increase your dose.
I am sure that the depression is effecting your relationship. Can you talk to your boyfriend and let him know what is going on with you? I think that would bide you some time to see if your feelings change if you are feeling better. I hope that this helps a little.
Oh, welcome to the forum... There are a lot of wonderful people here...
Moderator-Depression and fibromyalgia
fibromyalgia, Chronic fatigue, depression, allergies