Flu shottssss

Ok so my son has ALL vaccines and I'm very pro vaccine. I just feel AWFUL when they stab him with the needle lol I also have anxiety all day because of the risk of fever, which I KNOW is normal, I'm just a freak lol. Anyway, how many are just getting 9 month shots then waiting a little while for flu? Only a couple weeks later, not months lol. Thinking about just getting his flu shot separate since itll be his first time. Since hes also getting a finger prick for lead testing :/ poor guy lol