If your muscles are aching, then you should consume something that has high protein in it. Also allow your muscles to rest. They need time to heal and regrow. Don't worry though. It's a good thing and normal. It's known as DOMS. It's normal when you've begun to do something new or changed your exercise & it usually leads to greater stamina and strength. The first time I experienced it was a few weeks ago, and walking was hard for me, sleeping was hard for me, sitting down, getting up, going upstairs, everything really. After a day, it was still aching and I decided to brisk walk through it. It felt a bit better. But then the next day it was the same and it ached, and I still walked through it. And finally after about 3/4 days the pain went away. But now I feel much stronger.
Just don't overdo it, because then your muscles will get weak and never forget to consume some high-protein food.