thanks for the replies everyone.
tbh i don’t think it’s a panic attack,as i can use the buses with no problems.
being a bit of an idiot,i was wearing a hoody yesterday (as i thought it was going to be cooler than it turned out). that mixed with the sun heating me up through the window started making me feel queasy/sweating suddenly.
i suppose my worry about feeling queasy from my last bus ride (to the same place devizes to swindon and back) may have been an anxiety of sorts.
i have suffered with the odd bout of motion sickness whilst in cars/buses e.t.c going back to childhood,but it’s not very often i have to say.
will look into buying some anti motion sickness tablets in future.