I have a very tender sore stomach for days after constipation, is that normal?

Yes. If by tender sore stomach it feels like your abdominal muscles are very sore, this can be normal. If you had to do a lot of straining during defecation, you can strain your muscles. Ibuprofen can help, and as your constipation gets better, your muscles should start to get better in the next 2-3 days.