Tips for flying while pregnant

I'm flying to Florida this week for my nephews first birthday! I'm 19 weeks pregnant and anxious as I've been having nausea still as well as swelling and chest pain. Are compression socks necessary or is this just in the third trimester? I don't enjoy flying but wanted to be there to see my nephew turn one and celebrate with my sister. Any tips on making flying more comfortable while pregnant and struggling with anxiety? It's only a three hour flight but I'd like it to go as well as possible. Thanks in advance!