Really anxious about my babies 8 week jabs. Are they really that bad ?

My baby is having his 8 week jabs on Friday and I am so so anxious. I have cried a couple of times and my partner is taking him as I can’t bear to see him in pain. A wimp I know but hey! Are they really that bad or am I over reacting ? I’ve heard some really horrible stories. Also how poorly have your little ones been from them? And how long did it last? Please help me feel better!!