How are you supposed to do anything if you are so exhausted in the first place?

Today i actually tried to go out and run errands with my parents. We went to get ours suburban smog checked, then went to pick my dog up from the groomers, and then went to the nursery to pick up a tree that my dad is going to plant, and then met a friend at a local car wash to swap cars out to get cleaned. After my mom and i went to the barn for a little bit, and i could barely do anything. I just put her in the round pen and sat down in there with her. I was so exhausted and hurting at that point i couldn't think straight or do much of anything anymore :(

Im sick and tired of having no energy to do anything anymore... ugh
hopefully tomorrow is better.