Blimey loads going on there. Got to say it sounds like more than one fault hitting you there I trust its getting regular preventative maintaince.
First place I would go looking is our chain and sprockets for your juddering in first and second the bang would comman ply be a jumping chain. Miss adjustment or simply worn out. Check the front sprocket they wear at about twice the rate of the rear. This will also send shakes through the whole bike.
If all is well there check your front brake discs and wheel bearings. A loud bang might be a a disc bolt working out and striking something snapping off but I'd say it's more likely a collapsing wheel bearing.
For your own sake don't ride it until the fault/faults are found they don't sound like something that wont just sort it's self out and could well be catastrophic if it lets go.
Give it's a check over. Don't be worried most things are easy to fix. Check your safety drive line, suspension and brakes.
Lack of maintaicece or improper chain adjustment is a very comman issue on 125's due to lack of experience. Do you have a workshop manual or an an experience buddy that can hold your hand looking for the fault.
Vibrations and bangs aren't a good sign. Get a jack and lift one wheel at a time and spin the wheels listening and feeling for anything that isn't right. A d give the wheels a shake feeling for side ways play or wobble.
It's all basic logic. No tricks just have to check it all over and if in doubt ask. Everything should run/spin move smothley and quietly.
If you are lucky it's something silly and free to sort. If not it could cause an accident. Always best to check.
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