why am I like this?

this is very trivial compared to some postings and feel awkward asking for opinions but having retired about 3 weeks ago was expecting to feel on top of the world racing around like a whirlwind as I was doing. Instead seem so very tired and feeling upset and worried all the time. Have to say the last ten years have been a real roller coaster what with teminally ill grandchild and parents on both sides passing away plus other family members who are older looking for support. Will this pass soon and will I be able to do all the things I had planned. Again sorry to moan about nothing at all really