The pain from the buttocks and leg and foot -- fit with sciatic nerve irritation.
The fact that both legs are occasionally involved helps to pinpoint this to your lower back, the lumbar spine.
I would guess that you have a L4-5, or more likely an L5-S1 herniated disc in your lower back.
If you've been having this, discuss the possibility of a MRI of the lumbar spine with your doctor. This is not the typical presentation of MS.
Just to summarize,
Taking neurontin once a day 100 mg
Taking myonal, muscle relaxant once a day
Taking B complex supplement once a day
Taking antihistamine for the urticaria, 2x a day...
Since no pain in the buttocks, and stopped the mefenamic acid drug which caused my allergy...no pain killer is taken...
Im scheduling my MRI.
I would discuss this with your neurologist.
They may suggest a test called an EMG to look for nerve damage, and where and what type of damage this may be. They can also examine the MRI to make sure there isn't anything that was overlooked.
You do not see the sacroiliac joints typically on a lumbar spine MRI.
You can see the L5 and S1 nerve roots (which are the origin of the sciatic nerve) but you do not see the sciatic nerve itself.
A normal EMG suggests that there is no severe nerve damage.
Perhaps seeing your doctor and asking for evaluation for muscle pains (myalgias) and other rheumatologic issues, since your nerves appear to be OK, would be worthwhile.