I think I got my BTC jacked, I have NO idea what happened?

Help! This morning I was shopping online looking for a deal for xmas gifts, found what I wanted. The company gives 5% off on BTC transactions so I went to my BTC ATM and got BTC to my wallet(Electrum phone app) from ATM. When I returned home the price had changed , so I changed my mind. 2hrs later my Electrum account says 0.0BTC? I never sent anything to anyone. Blockchain has no record of any transaction from my address or the address that my electrum says it was sent 2? have people found a way to hack electrum? This goes against everything I believe possible. I had a transaction go missing last month also were the receiver claimed he never received my BTC. I feel like I am in a different Universe, I have the receipt from the ATM otherwise I swear I dreamed this. Please Help!!!!