Voltaren gel questions...

Hi there :)

I'm on this site because I'm being treated for Lyme disease but I figure this section might have better advice on voltaren gel.

One way this has affected me is very bad quadricep tendonitis.

My doctor has prescribed voltaren gel.

Here are my questions, any help is much appreciated :)

1) can I use a heating pad with this product?
(I know it says not to)

2) is this good to use situationally, such as long car rides, while exercising, etcetera...

3) does anyone have insight on using this for tendonitis/tendonopathy?

Thanks for your help!!