Anyone else feeling terrible?

Steph
Im 21 weeks and just had to call into work sick as i could not bare to go in im so exhausted and getting morning sickness back again. Now i can't stop crying because i feel like im failing at being pregnant so many women do it so why am i finding it so hard when i thought this was going to be the best time of my life. I have put on alot of weigh and i feel huge and uncomfortable all the time,i work on my feet all day,everything feels like a struggle some days. I feel like i will need to cut my hours at work but i still have so far to go that i feel stupid for thinking it. Im getting married in 4 weeks so have alot on my plate right now, i never thought it would be this hard. Anyone else have these days? Please say im not alone