4 weeks ago, at 14+3 weeks, I began getting horrendous cramps in my lower back, back passage and lower abdomen. It felt like terrible trapped wind, but whenever I did break wind
it hurt very much just before but didn't really change anything. Except my dignity in front of dp!! Went to A&E, nothing. Saw a doc, nothing. Felt embarrassed at my obsessiveness. Started bleeding after 3 days, and went to the EPU, who pulled out (bleurgh) lots of clots, but after scan thankfully found nothing wrong. However, a threatened miscarriage was diagnosed, which I think is normal after pain and bleeding. After a few days the pain and bleeding subsided and I felt well after about 2 weeks.
So, back at work last week all felt great. Then on Saturday, at 18+1 weeks, the whole thing started again. Horrendous spasms in my lower back with sharp pain in my lower abdomen. Feel constipated but am not. Can't sleep for the pain, paracetamol doesn't touch it. Hot water bottle helps a bit. Can feel baby kicking so I know I shouldn't worry but just can't help it.
This is my 5th pregnancy, mc'd last Christmas. Can anyone shed any light on this? Has anyone experienced the same? Should I just shut up and put up?! Is it because I've eaten so many biscuits?? 
Sorry for TMI by the way...