How did you get the ephedrine? The stuff in most diet pills is mixed in with a bunch of other stimulants - I had a bad experience with lipodrene similar to yours. With the bronkaid ephedrine, I get a cleaner stimulation with only slight nausea at times.
Ephedrine is crap! Awful stuff, just gave me palpitations and made me generally feel awful. That's before you even get into the exhaustion from being unable to sleep. It's the base ingredient of methamphetamine. Lovely. If you're vaping nicotine too, it's probably a partnership from hell in messin' with your heart!
Alli is where it's at for me - I'm so glad it's available OTC in the UK now! You just need to watch what you eat, as too much fat intake will give you a rather unpleasant side effect that I won't go into here - which I find useful, as it makes you stick to a low fat diet!