There are two stores that have been very understaffed and need me to keep operating. Because of that I've been working at both locations back and forth full time. As of now I've worked for 8 days in a row for 8h each day (coming from two 5 day 8h weeks back to back). The last days and especially today I've been feeling extremely burnt out. I can't sleep anymore. My mind is racing. The stress is getting to me. Whenever I brought up that I've worked that many days without a break by now to coworkers, they either don't really think much of it or make some sort of comment that this is no problem for them. This makes me feel that maybe I'm just not used to it and not strong enough. Is it normal to get this burnt out or do I have some sort of problem?