Hello.Some symptoms that you have may be due to sciatica
fractures, but other symptoms, such as pain in rectal area, it is difficult to be caused by these pathologies.Nerve disease is diagnosis to rule out.
NMR is more sensitive test than CT-Scan for diagnosis of nerve disease,I think that NMR must be requested.
By now, any physical exercise is contraindicated and should take painkillers
50 mg thrice a day is widely used in the treatment of back pain
Go to your doctor for prescription and to consider request NMR
I wish you good health.
(In case the answer would have been useful please indicate this)