2012 1.4 d4d Auris Problems

[D.Lynch2000]

Hi how are yous all? Ever since I bought my car I've had this noise coming from somewhere in the engine bay it's a loud vibration while driving

Problem 1

So basically I can go into 1st 2nd 3rd 4th  no problem but when in fifth I might drop my speed down to 75kmh and then put my foot down and try to bring it up to 100kmh at around 80kmh/85kmh this loud vibration goes through the car nearly like the engine is struggling but it just loud vibration,

Problem 2

and today when I was dropping into second to enter a round about, went around the round about in second  and exited the round about attempted to shift to 3rd but the gear stick got stuck in neutral, there was just no movement I could select any gears atall I tried turn the car off and on and a bit of pressure on the gear stick while clutched and clutched just nothing until i some how managed to some how free the stick and went back to working normal, any help appreciated

[furtula]

How many miles on the car, is the clutch original?

When the vibration happens, do rpms go up, but speed stays the same?

Was there any grinding from gearbox when trying it was stuck in neutral and you tried to switch?

Have you checked the brake/clutch fluid reservoir, is there enough oil ?