sounds like atypical migraine (hemiplegic type) to me.
There does not need to be a headache.
Barometric changes, such as climbing, are a well-known trigger.
I occasionally get a "silent" migraine, with amazing auras and tunnel vision - my doctor gave me the term for that which I have since forgotten. There is no pain.
It's associated (for me, anyway) with stress plus caffeine.
