Songstress,
Depending on your financial situation would be if you could stop the second job...I would. The first job was your first and you really enjoy that one. By them changing your schedule around so you have to change the first job around you might affect that 1st one right? And since you enjoy it so much, it would be a shame to let anything happen to that one. I've recently had a job like that. They told me that I would be working until this time. When it was time for me to go, she said no I told you that you would be here until this time. Which was a lie. They also messed with my hours on my last paycheck. They were going through alot of employees like the company you just started work for. It seems that people are just not wanting to be treated like dirt anymore. Go figure.

I did find another job that is more flexable that I enjoy so far.
So if it is a case that you need both jobs, keep them for now while putting in your other aps. That way you are covered just in case it takes a while for any call backs. Good Luck.
Safe Journey