Pregnant or not pregnant

Ok so I've been TTC for bout a year now and my body likes to play tricks on me it will start acting like its pregnant and even have a late period by weeks then it'll hit me with terrible cramps and start my period I've been pregnant but miscarried so I understand why it's doing this to me EVERY month now when that was 3 years ago help someone know what I should do ???? I'd take any advice by now I just wanna stop getting my hopes up and it's physically killing me going thru all this stress