Hey BlueJay, are you trying to do a bit too much? Maybe it's your bodies way of telling you it needs to rest? Listen to your body, it's going through a tough time at the moment, so drink lots of lovely water, rest a bit more, and be very very kind to yourself, you're doing great honey!! Really proud of you.
Hugs.
Everything you are feeling is normal. Congrats on day 4 but for most it is one of the hardest days. Give yourself a break honey. Light exercise is good and hot baths with epsom salt as many as you can take. It will help to ease the muscles. Hang in there and keep going forward. Whatever you do just don't use!