Othello Syndrome / extreme jealousy

I’m 28f I realized my jealousy over partner is so extreme and I just want this to go away. I know therapy would benefit me alot but I can’t afford it now. Does anyone have experience with this? It comes and goes. I just found out about Othello syndrome and I’m afraid I have this.

I have bipolar2 and adhd and I’m taking Lamictal.