Definitely things worth trying, but My DS hates swaddling and he unravels the swaddle with his hands and feet in 4-5 mins (sigh) 90-minute rule seems very interesting and I will try that on DS. Thank you for your time to answer my question.

Reflux summed up all the symptoms DS is having atm: being fussy, sudden screaming, squirming when breastfeeding, finding it hard to swallow his mucous, vomiting etc. I now raised a crib so that his position is a bit tilted. He is fine sleeping for now. Will have to watch him if he sleeps through the night okay. I will definitely visit a hospital first thing tomorrow morning. I also want to apologise for asking several questions in one go; did not know that there exists such a rule. Thank you guys for sharing your knowledge; I really appreciate it.