Talk to Ent Specialist on Ear Blockage

Aoa dear drs, i m currently 5 months pregnant. The issue is that my ears get blocked. Every year during winters my ears get blocked without any obvious reason. Initially the blockage remain for 2 3 hours after i wake up but after few days, ears remain blocked throughout the day. The issue occurs only when winter arrives.In the last two years, I went to an ENT specialist, who cleaned my blocked ear and told me it was caused by wax buildup. But why it occur only when winter arrives This is the third time my ears are affected and now my right ear is completely blocked since yesterday. Due to this, i m having headache too from that side. Kindly guide me what should i do?