Stressed beyond belief...

As if the beginning of a pregnancy isn't stressful enough with all the emotions and what-would-bes and such. DS will be 5 at the end of this month and is ADHD/ODD. He is already medicated (after evaluation by psychiatrist and Pre-K teachers), and 504-OHI at school. His tantrums have gotten worse since DH took a new job and started in the last week. I'm so scared the stress I'm having to deal with is gonna cause additional problems for me and baby. I'm already sick with another blasted sinus infection (my 4th since the year began) and now I'm having some minor cramping after just been through another fit with DS. Just feeling overwhelmed and don't know what else to do. Drs just want to adjust meds which never seems to help. Counselors say to disengage and ignore it, which just drags it out and seems to make it worse. Then out of no where, a switch flips and he's back to his normal, happy self. Ugh!