Lately I have been getting sick at least once a week after I eat.It has also been happening while giving head. I used to be amazing at deep throating until these past two months. Today when I threw up while giving head it was a rather large amount and got everywhere and I was extremely emberessed. I really want to know what is causing this to hapoen all of a sudden. And I have taken three pregnancy tests so it is not that.

You have exhausted your gag relfex, suggest you not give any more head for a while. That deep throat approach probably has done some sort of damage. Could be you should see an ENT specialist (ear, nose and throat), but don't know how you would explain, if you are shy, what you think caused it. But if you are proud of your 'deep throat ability', shyness would not be a concern.

You can not do a pregnancy test till you are at least 2 week late with your period. So testing, if you are not at least late, has no use.

But there are plenty of reasons for this, but it will take a medical exam