I certainly don't know how you can live in TX. I have some tips but I'm sure these guys have more.

Get groceries at night when it's somewhat cooler and the sun has gone down a bit. Or first thing in the morning. Make sure you have plenty of water with you because staying hydrated keeps your body cooler. I used to always have water and ice packs with me in the summer. I can get so bad that I need to cool down my body quickly, either by blasting the air or cool packs or both.

I simply don't go out when it's hot anymore. It tanks my MG so quickly. I'm lucky that we have a grocery delivery company here so I use that when it's either too hot or cold.

Be careful, whatever you do. You can get weaker so slowly that you might not even notice it. I hope you find ways to cope.

Annie