Do Beta Blockers Influence the Results of a Diabetes Fasting

Hello, im new in the forums and to diabetes as well. However i have a Question i went to the doctor like a month ago due to a few palpitations i had (not related to diabetes i guess), and he ordered a bunch of tests for me to do. In the Fasting one i had 92 on the sugar count (i have always been in the 85-95) range all my life, however he decided to make the glucose tolerance test, the reading i got when i got there was 91 then after the first hour i got 210 he said the maximun was 200, and then in the second hour i had 170 he said the maximun was 140, by the third hour i was back to 86. After seeing my results he said i was a Diabetic prescribed no meds only to lose weight (im like 40 pounds overweight) and exercise. Im also been taking beta blockers a week and a half prior to the test (25mg every night) and i wondered if that may influence the test somehow, with my current insurance policies i cannot see another doctor right now, (ill try to solve that because i want a seccond opinion) so my question is if im really a diabetic or if the beta blockers (metropolol) are messing my test results.

Thank you in Advance.