Loss of power, very low power on reverse

[Camou2]

Certainly sounds like something is going on in the transmission. Have you checked the obvious; fluid level, leaks, etc. Do you have a Scan Guage to pull codes to see what the computer is telling you? Definately sounds like it is probably a visit to a transmission shop. Wouldn't drive it too much if symptoms continue because you can only make transmission damage worse by driving.