I can’t drink coffee anymore!

Over the 2 months I’ve been doing this I have reduced my coffee intake but this last couple of days it has been giving me terrible heartburn! This is the first real side effect I have had. I took my last .5mg dose Wednesday and am going up to 1mg this week and I’m a little scared that it’s going to cause more side effects! I don’t plan on going any higher. Hoping that’s the sweet spot to upper my weight loss some.