Long lasting periods???

Anyone else go to a doctor with this same problem and have a diagnosis for it??? Can’t get insurance yet bc I have to wait for the right month in the year to be able to get it and I’m really worried...my periods have been lasting for like 3 weeks sometimes the whole month...and then there are some months I don’t get one...I’m so scared I won’t be able to have kids😭😭😭 it would be comforting if someone else who experienced the same thing could tell me what the doctor diagnosed that as and if they were successfully able to conceive.