Just started 37.5mg Effexor. I'm on my 4th day and can tell it is already giving me a boost of motivation. Just wondering, the ONLY side effect I have is constant heartburn. Wondering how long this will last? I have noticed it helping my OCD and ADHD and more energy, but the heartburn and burping caused me to puke this morning so I sure hope my body gets used to this and this side effect ends.