Choking on saliva in sleep

I am 19 weeks pregnant with my first pregnancy, I currently have a chest infection and severe cough and I have one day left of antibiotics. For the last 3 nights in a row I have woken myself up on the middle of the night/early hours of the morning g from a deep sleep choking on my saliva and it is terrifying. I will be gasping for breath for minutes afterwards and have a coughing fit that feels like it’s never going to end, followed by a really bad sore throat and dry mouth. This is happening even with having a hot drink shortly before bed, sleeping on my left side and having my head and neck propped up on 2/3 large pillows. I am scared to fall asleep now with this keep happening. I don’t know what to do about it

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