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Your pulse can get high when you are fighting an infection.
Things like fever and dehydration can increase your pulse. A low blood pressure will also cause your pulse to be faster than usual -- and the lightheadedness that you are having seems to fit with low blood pressure.
I would increase your fluid intake now (to help with the blood pressure/dehydration) and rest. Certainly if you feel that you are getting worse, a trip to urgent care/ER for IV fluids may be needed.
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Yes, that can happen when your blood pressure is really low (called syncope).
If you can, check your blood pressure and make sure it's normal.
If it continues to be really low, you should get this checked out.
You don't have to have a history of blood pressure.
If your blood pressure is low now -- because of your recent illness and dehydration -- it can cause exactly the symptoms you describe.
This is what you are experiencing:
As long as you feel that this is getting better.
If you continue to have lightheadedness to the point you are going to faint -- you should be seen sooner.
Best of luck to you.
The dizziness is more concerning, because it could cause you to fall and hurt yourself.
It doesn't sound like specific heart issues here.