Welcome to the site. Please get a 2nd opinion with a gyn/onc. They are specialists in the female reproductive area. Congratulations on the birth of your baby. I just wish that your pain was gone. A gyn/onc has seen it all, so that would be the best place for you to start. I am not recommending one because of cancer - but because they have several years more education and they are specialists. You are in my thoughts and prayers. Godspeed
~Tascha
Have you had a consultation with a urologist, to rule out any additional problems with your urinary tract? I would suggest following that avenue as well as seeking advice from a gyn specialist. You could also seek a consult with a fertility clinic. Endometriosis is a common cause of infertility in women, and thus these clinics usually have a 'endo specialist.'
Your symptoms read much like those of a member of my family. As soon as she and her husband "finished" their family, she had a complete hysterectomy. The procedure restored her 'life' to her, as before she had the same problems that you report, including being bedridden for days from pain and heavy menstruation.