Constipation and nausea advice???

Christina • SAHM to 2 boys; Hairstylist
I'm just wondering if anyone has some ideas on things that help with constipation. It's SOOOO bad. Plus I'm having trouble stomaching anything besides starches and dairy. I can't even get lettuce down. I know chia seeds are supposed to be good but I've heard mixed things about taking them during pregnancy and I'm high risk so I'm super nervous about everything. Anybody have anything that worked for them that they were able to keep down?