<human>: Can you succinctly summarize the text in 1-3 sentences?

So, I took sudafed for a cold a few months ago and I discovered that I freaking love sudafed. It gives me tons of energy, and kills my appetite with none of the crappy side effects of diet pills like aggression and caffeine induced shakes. I don't use it every day. I'm a server and work long shifts on Fridays and Saturdays so I've pretty much been taking a 12 hour every Friday and Saturday for the last three months or so and popping an occasional one on the weekdays, I don't seem to be building any sort of tolerance for it yet, but I'm wondering if there are any other side effects of essentially taking sudafed recreationally. I've looked into it a bit online but most websites list the major side effects as loss of appetite and sleeplessness (yay for those!) Anywho, any insight is appreciated.
<bot>: I take sudafed 2-3 times a week because it kills my appetite and gives me energy, what's the worst that could happen?