Struggling

I’m pregnant with baby #2. I have a son who is almost 2 years old. I hear how so many moms feel scared they will never love their 2nd like they do their 1st.....and I just feel the exact opposite. My son is off the walls lately, and is constantly fussing, and getting into everything. I’m loosing it. I’m also exhausted and am struggling to deal with it, much less be the best mom he feels I deserve. I just need to know how you guys deal, or that I’m not alone.