Nausea!!

I'm 7weeks 6days and today has been nonstop nausea. Last week at 6weeks 4days I had some nausea but mainly in early morning and it stopped after one or two days. But I have had nausea since thanksgiving and today it was so bad! I'm making myself eat because I know I need to but I just feel so miserable. Any ideas on how to get rid of it or lessen the severity? I haven't tried tums yet because I don't know if I am able to.