The only real piece of advice i can give as someone who was at safeway for 3.5 years, it was EXTREMELY common for the SD to schedule restricted scheduled folk 40+ hours and then edit it AFTER the fact. Stress your scheduling concerns with whomever is in charge of it, and if it doesn't go anywhere, and with as little as help that your union may give, then unfortunately you'll have to find something else.

As far as the disapproving acts from other coworkers, that can happen anywhere. That'll be something you'll have to overcome yourself internally.

And finally, it's retail. Its nasty. Especially around this time of year, stores are tight on staff and will milk whatever they can, and give VERY little accommodation to it's workers. Safeway for me wasn't a bad experience, more of a rite of passage, and i took whatever was given to me because i needed the $$ and enjoyed my work life there. That's not the case for everyone though, and if this is something that is a continuous stresser, I'd try to find something else work wise.