Help please - so confused about prescribed supplements.

My doctor has suggested several over the counter supplements to help with my migraines, which are becoming more frequent as I get older. I ordered about £40 pounds' worth from a reputable source, but am confused about the amounts I should be taking.

I told my doctor I already take a multivitamin every day, and have done for years. I'm worried that now I may be taking too much of certain supplements by adding those she has recommended to what I am already taking.

For instance, the vitamin B2 she recommends already has 7mg (the sign that looks like 'ug') in my daily multivitamin. The separate vitamin B2 I have bought contains 50 mg., so I am in fact taking 57mg daily. Likewise, the B12 she recommends already has 50 mg in my multivitamin, but the separate tablets contain 100 mg., so I am taking 150 mg. daily, and therefore seem to be taking too much. (the B12 says on the container 'do not exceed recommended daily dose, so I have now stopped taking the separate tablet).

I really don't want to stop my daily multivitamin, as it contains other supplements which (I hope!) are doing me good. On the other hand, I want to follow my doctor's advice on relieving my migraines.

As I can't get a doctor's appointment for some weeks, should I ask a physician assistant or even the pharmacist about this?

Would appreciate any help from Grans who have been in a similar situation. Many thanks in advance.