Can I take vitamin d 2, 000 iu vitamin B12 100 mcg and folate everyday? Doc told me I was defficiant in all 3. I'm also on toprol (metoprolol) and Synthroid

Common amounts. These supplements in these amounts are common as a daily addition and not a problem.
Yes. Yes, if you're deficient and your doctor prescribed them, you should take them. Follow up with your doctor and see when the levels have normalized, so you can stop taking them.