Mood/emotional

Im 16w3d pregnant. And im in a right dark mood, nothings put me in a mood but i just feel down, upset and bit fed up, lonely. Anyone any ideas how to come out of it? Same happened last week and i got panic attacks for few hours. I dont want the same to happen as im at work in an hour...ive tried a quick nap, eaten and something to drink. Im really battling the tears. I dont want to be at work and just start crying as im a support worker and wont look very good will it.