should I see someone

Ok so lately Iv been feeling rely bad about myself not like body image or anything like that 
But I keep snapping at my partner and even family for no reason and I don't realise Iv done it to I already have! 
my family and partner are thankfully rely good about it and don't make a big deal and just go on with what they are doing 
At times my partner will just grab me cuddle me and remind me it's ok to have bad days with everything I'm going through and I just fall apart  
But I personally feel bad that Iv done it 
 I'm 21 weeks pregnant and my last pregnancy I was very emotional but this time it's worse 
I'm always stressed and tired I can sleep 12 hours get out of bed and wanna go back 
I keep getting tears for no reason just over something stupid like this morning I accidentally spilt a little bit of  dish washing liquid on myself something I would normally laught at myself about
I'm struggling with the fact Iv been informed I won't be able to breast feed and feeling rely down about it my last child I tried but this time I need urgent medication after baby's are born that they are concerned my hurt Bubs if I breast feed
 the medication is for liver cancer and I also gotta have surgery 
Iv already got 2 beautiful little ones boy 3 and daughter 9 
Neither pregnancy did I hate my own action I just had days where I didn't feel ok 
I don't understand my own action or feelings right now 
:( for the first time in 6 months I went to the gym the other night just to let it all out the boxing bag was helpful because I was so angry at myself afterwards I just feel apart tho  but my doctor has advices me bed rest today 
I love the ads anonymously on this cause I don't feel I could talk about this I'm scared of what my partner and family my think if I tell them and I personally just wanna feel ok