From all I hear and read I'm a little wary of clen. Do you feel a sense of general fatigue with it? A few people here described on this site describe feeling fatigue and feeling shitty in general. I'm leaning more towards ephedra/caffeine over clen. I've done this before and I felt exhilerated on it and it's pretty effective. I don't like feeling anxious and shaky and clen is not really good for the heart.