Spotting for 4 weeks

I am hoping someone can help me. In May I experienced a period for 6 weeks, a pretty steady but light flow. I saw my OBGYN and they found a 3 inch cyst, it burst about 2 weeks later and my period ended. Then September 3rd my period began again (normal for irregular periods) it lasted for about 5 days, first 2 days heavy then lighter and lighter. After about day 7 it appeared that it ended, then about 2 days later I started to spot again this would be around Sept. 8th, it was very dark brown and almost blackish, by the 11th it would fade away for a day or 2 then I would spot again, this time light pink and very faint in most cases, almost like it was going away but never did. I saw a new OBGYN (mine on pg leave) the OB did an exam and what not and found nothing, my pap smear was normal, no cyst found nothing, she felt that my body my be shedding old blood. About Oct 2nd my spotting started to get a little heavier but only when I wipe, I have had no pms symtoms, no zits, larger appetite or bloating, only mild cramping, this is very unsual for me as I always breakout in zits 3 days before my period. I have been very tired, loss of appetite, my husband and I are trying for 2nd child and I know I was ovulating during the week of 15th, I've been using the ovualtion kits but all the pregnancy test have been negative including the 3 at the clinic. I'm very frustrated with this trying to have a child and my period does not want to end and my substitute OB is not a big help. Please help me I don't know where else to look.