What's the cause of 07 honda lack of power?

When i was driving in traffic i noticed once i looked at temp gadge it was pretty high. Not maxed out so i immediately pull over. Cooled off so i continued thinking it was just hot and the traffic was bad. So i wemt on and it got hot again but this time i had no choice but to drive since ppl were ahoes and wouldn't go around when my flashers were on but there was no shoulder. Had to drive with it for 3/4 of a mile like that. I got it too walmart put fluid in the radiator and it hasn't over heated since. But from that i lost power. I did a oil n filter change and put new plugs. Helped a small amount but still having problems. What do i do? No oil in fluid no water in oil. No moisture in cap. Seems to run rough too.

If you needed to add coolant, there's a leak. Get that fixed. Don't forget to look at the water pump, which will leak at it's shaft seal weep hole. Lack of power might be the result of damage to the engine.