Eat well - try not to rely on sugar/lots of carbs as they make you sluggish. Sleep whenever you can. Exercise gently, get fresh air and do relaxing things when you can. It's horrific with #2 as looking after your first is so demanding and you don't have much time for yourself.
I didn't take any of the above advice as I had terrible sickness and lived off crisps and flat coke and lay on the sofa all day. However, I did get signed off work, which helped! I never got the energy/bloom of the second trimester, but the fatigue did lessen. Hope you feel better soon.
i work in a pub too, i do full time and that early pregnancy i didnt feel too bad it hit me when i was about 8-9 weeks but it hit i was very ill aswell but felt like i coulndt sleep enough. around week 12 i felt great and enjoyed being pregnant. i am 20 weeks now and the tiredness has hit me again but this time its hit me hard and i have had to start cutting my hours. you may benefit from cutting your hours slightly at the mo as i did just untill you feel better
Food, exercise, naps, caffeine (when desperate), super cold drinks, pleading with god almighty, showers basically ANYTHING until it passes at about 12 weeks.... also worth noting mine peaked at about week 9 then got significantly better.