As everyone else has said stick at it. 1988 first hour in a Chipmunk for AAC grading was sick as a dog. Sorted until on instruments then felt sick again ! 7500 hours later not a problem
Couple of tips, always fly on a full stomach and make sure you are well hydrated with water NOT Coffee or Tea you will be surprised at how hot you get in a training machine without noticing it. The bodies reaction to heat stress is nausea ! Last one always look up !
Stick at it, it is worth it