No gaviscon for me. For my first it was bloating. Bloating so much it hurt and felt like I could be popped after eating the smallest amount of food. Taking ginger supplements has helped this time round but I still get it occassionally.
SPD/PGP/back pain. I'm 21 weeks now and it's just started getting bad and walking around is becoming an effort. Last time I was in tears at 24 wks until I discovered the chiropractor who became my hero.
How much it irritates me when people ask how I'm feeling. Shit. I feel shit. Now kindly fuck off please!
That when people say 'you're pregnant, not ill' it's a load of bollox.
How much I really really don't like being pregnant. Last time I couldn't wait to get DS out. He was 5 days early. This time I'm high risk for preterm so I'm willing her to stay in as long as possible at the same time as really not enjoying it! 
How lovely it feels to feel your baby moving around inside you.
How worth it pregnancy is. I was completely in love with DS as soon as he was born. The first week was hellish (I blame a failed attempt at bf'ing), but he is absolutely the best thing ever.
Forums wise, I use MN and just google for any additional info I need. Also using FB support groups this time round due to high risk situation. I can usually find most stuff I need.