some very good and sound info here from all
plan conservative, physio with emphasis on spinal and SIJ stabilistaion +/- belts and acupuncture.
if after 3-6 mths of intense adherehece to exercises and if you cannot progress them due to pain, then yes prolotherapy is a good and very effective option. we used it in the UK when i was there and had very good results but only after exhausting all conservative measures first.
it is paramount to continue with the stabilisation as the injection will not in itself cure you but enable you to do the exercises and progress them