I think what is probably happening in your case is that the sciatica
, as confirmed by your MRI also, is the original thing that was causing the pain.
Now your doctor has suggested some steroidal therapy to you as well for the purpose of relief from the pain.
Now while the therapy is effective, one must be aware of the huge list of side effects of steroids
. One of the side effects of steroids is excessive gastritis
And I think that it is this excess gastritis that is causing you trouble and making you feel like you are bloating.
I will suggest addition of antacids like ranitidine
or better still omeprazole
. This may help you.
Best of luck