CBD oil can be very helpful but it is VITALLY important to get a good one.  Unfortunately, in this instance cheap does not equal good.

My advice is to get yourself along to a really good INDEPENDENT health food shop, ask to speak to the manager or the owner and ask them to recommend their best brands.  There are a lot of shysters out there, jumping onto the CBD bandwagon so please take advice.  

(I know all this because I used to manage a health shop and we were bombarded by CBD suppliers wanting us to stock their product.  Fortunately my boss is very knowledgeable and picky about such things).  

Good luck!