There's a number of answers unfortunately. My experience was that they made no difference. That may not be the case for everyone, although if you google "does CoQ10 alleviate statin induced muscle pain", you will find several different answers.
I was unable to get advice from my GP and it's not in the BNF so it can't be prescribed, there's also several suggestions as to how much to take. I tried several amounts and again if you use Google, you'll get several answers.
There's also a question mark over the quality of the CoQ10 that you use. I know people on other forums take CoQ10 for other reasons and are pleased with the results. It could be a case of suck it and see.
Sorry I couldn't be more help, it's not that straight forward.
I do know all about muscle pain, sleeplessness and brain fog. I stopped taking statins and still have brain fog after 6 months. It's worth noting that my total cholesterol is still only 5.4, not perfect in the eyes of NICE but what do they know? I could lower that by exercise as I have done in the past.