Salutations Bezerkben,
...don't know if I'm going crazy...
If you are then that makes two of us.
...i seem to have a dry cough (not something thats linked with vaping) right?
If i don't wash my throat by taking a sip of water before and after a toke then chances are i'll get the 1st warning sign within the next minute... It's like irritation occurs on contact, or at least at first.
...i have had sneezing spasms and some itchy eye/skin.
Deja vu, except i call it rafale sneezing and soared eyes. Though i'm sure it looks just the as miserable.
...been vaping now for about 7 months and have only started noticing these symptoms within the last few weeks.
My trouble started about 6 months after i had started modding my VG pipe, it didn't seem to cause such severe concerns while i was using my HerbalAire before (~25 months) - but in retrospective i can see now how it became necessary for my to address dryness issues even with the HA, though i just thought i didn't like excess dryness or my tokes were simply too potent and dense.
...ill become itchy and sneeze during random times of the day...
If i had too much the night before then not long after i wake up it will start without any apparent cause, but often enough i find relief by chewing 3 pieces of strong aromatic gum at once to make it pass for the most part.
...never when in direct contact with cannabis or shortly after.
So far i rarely experienced itchy skin unless there was contact and this doesn't occur frequently, not to mention i suspect there may be opportunities for indirect factors...
Could i be developing an allergy or is it just coincidence?
Maybe it's time to try blending with pre-vaped (depleted) material to render your dosage milder... I'd suggest exploring different setups/temperature too.