Does anyone else struggle with working out?

So, I recently started going to the gym. I'm overweight and I'm trying to change that. I noticed that every time I workout one of the following two things might happen.

1. I get horrible after workout fatigue. Even when I do eat a healthy breakfast I still feel terrible after working out and I want to eat a mountain of food. I also feel shaky like I'm going to past out. I feel dizzy when I get off the machines sometimes.
2. I can't workout because of the painful unbearable workout sensations.

Right now I feel so weak i can't move my limbs. I don't know what to do, I feel like I'm going to throw up...

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Bushranger · 70-79, M

I'd talk to a doctor about those symptoms if I were you. Have you been checked for diabetes or cardiac issues? It's better to be safe than sorry.

But don't give up on working out, whatever you do. You may have to change what you are doing, but exercise is important.