I have been tested for vitamin B12 deficiency and all clear. I eat a fairly balanced diet.

I am taking metformin and simvastatin since being diagnosed with diabetes.

By RX drug, do you mean gabapentin and pregabalin (I've an enquiring mind lol... it'll bug me if you don't say... and I'll be searching for hours )

...and Mrs D, thank you for an incredibly prompt response, and for the offer off information and support. I run my own forums advising others on family law... and it's nice to be on the other end for a change. Have a lovely weekend.

Joe