maybe you've been going through more stress than usual or something has been bothering you, I've always been a really calm person but about a month ago there was a week where I suddenly became really anxious and I think it was from stress, so I'd suggest listening to relaxing songs as simple as it might be, and try taking naps if you ever feel exhausted in any way, and even if don't usually do this I think releasing stress through physical exercises can help most of the time. Taking a shower or a bath can help too, sorry if I'm saying too much at once, I'm just typing everything that crosses my mind in terms of relieving tension :D