I switched from 10mg of Lexapro to 37mg of Effexor and I'm probably going to go up a dose next week and I'm worried because I'm yawning non stop, my heart beat is faster, and I've gotten so confused at times I probably couldn't even tell you where I was. I've heard Effexor works well so I don't wanna drop it without giving it a good chance. Should I be worried? Should I switch?