LOL! This is hilarious but kinda swerving away from getting the guy some help...
It stands to reason that because the last thing you did before the problem started is change the tranny oil, then you need to start there. Check the level of the fluid and make sure you're checking it at the right place and with the car on level ground. If the fluid level checks out, and wasn't too low or high, then proceed to changing the fluid.
It's simple logic here. Go with the least expensive repair first and if that doesn't work, then move on. I can't say for sure if your clutch is going out, or if the fluid change will fix your problem. Someone mentioned a test to find out if your clutch is going, and it is a valid way of checking.
Hope this helps ya,

Will