I am having severe lower back pain but had a period only a week and a half -2 weeks ago. The pain is so similar or worse to those I would normally have during menstrual periods (or had during childbirth) except the pain is fingering slightly across my left side oblique. I have been having a small chronic lower back pain over the last few months but have associated it to tight lower body muscles. No birth control and never have periods earlier than by 3-4 days at most. Feeling nervous to fall asleep because I have a higher pain tolerance and it just seems off.
I would first like to clarify that back pains are of many types and not only related to periodic paining your case what I suppose you have been a mechanical low back pain hot packs would help you to some extend you can lie down, first intent it will hurt you but as you progress lying with legs bend from hip and knee you will feel relief. Exercise like static abdominal(can search the net with the term), pressing pillow between two legs (I'm the same position described above), will help you to relieve pain for further exercise you need to see a physiotherapist in your locality. Hope I have answered your query to your satisfaction, in case you want any further help feel free to contact me