You should take the head and barrel off and check the piston and bore for scuff marks.
If the piston has siezed in the bore
(which sounds highly likely from what you say)
it will leave bits of alloy on the surface of the bore and it should be carefully polished off with "fine" wet n dry paper.
You will also need to polish the piston skirt to remove the damaged areas to prevent it "picking up" again

If you dont, not only will the perfomance be severely reduced but it could seize badly or cause the big end to fail.
Either of which could throw you off the bike

From what you say, I think you are a natural born 2stroke rider

getting the clutch in quick

Old hands ride with two fingers over the clutch lever, in anticipation of such an event

(a regular occurence on older "tuned" 2strokes with practice you get a "feel" for the motor and can get the clutch in before it actually nips up)
Get it looked at asap

before you damage it anymore

Make sure that you secure the oil feed pipe to the carb feed by either a clip or a piece of locking wire twisted round it

Good luck Paul, I think you're doin really well sorting it on your own

Keep us posted
Em