Could be both! Take him to a pediatrician who can check the tongue tie. 7 weeks is a little old to get it reversed but might still want to look into it. It has other effects later in life. You may want to consider a lower flow level of nipple and burp every 20-30ml especially if he's choking and gaging and making a mess. If it's just reflux it will get better as he gets older!!
My LO is 8 weeks and the reflux symptoms started at 1.5 weeks. Pretty much everything you're describing. What's helped is feeding smaller volumes more often so like instead of 4 oz every 3 hours we'll do 1.5 oz every 2 hours. Slower flow nipple and pace feeding. Also keeping him upright for 30 mins after feeding helps. As pp mentioned it gets better as they get older. Definitely discuss with your doctor too
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