I dont think that’s high enough to get light headed, unless your a 100 lb. teenage girl (like, very petite with small body mass). Its possible, but maybe you are just hungry. What is the bottom number? 142/?
Keep checking it. BP changes throughout the day. I can start to get lightheaded 150-something over 95, but it kinda depends what you typically run and if this is unusual for you. If you run low, naturally, like 112/75, maybe it is making you lightheaded - depends on your baseline.
Call the Doc - you should always call the Doc about being lightheaded.