Missing my cycle for months!!

So I kinda really don’t know where else to turn to I am 27. Last year I found out that I have a pituitary tumor ( benign) I have been to the doctors countless numbers of times to see why I would not get my period for like 3months and then come on for like 3 months and not stop bleeding unless put on some kind of birth control. Ultrasound blood test EVERYTHING they have not found a legit reason or solution to my problem. I want kids one day and I am afraid I may not have that ability or it may be hard for me to carry I have had a loss recently in January this year but I was very early and was having bleeding issues so it didn’t have a chance and months later I’ve been regular. Now here I am again 47 days late I’m tired of wasting money on pregnancy test and creating doctors bills..... anyone can relate?? Any solutions?? Suggestions?? I am a very busy person so I assume stress plays a part😞😞 I just need answers....