I've been in contact with quite a few home educating families and I cannot see how a year at home at this age would do any damage. He won't be behind academically certainly. It isn't such a big step as you imagine, and there is nothing to stop you re-enrolling him at any point in a primary school, unless the school he is in now is your absolute preference and it is very very hard to get into.
If he isn't enjoying school at all, and it is creating terrible stresses to get him in against his will, might it be worth just seeing how it goes out of school? September is a lovely month to start home educating, there are usually lots of park meetups, everyone is quite energised at this point in the year and full of plans/sociability. There isn't any reason why he shouldn't see children and do interesting things/learn stuff at his own pace, even if he isn't in a formal classroom.
Check out the local home educating scene, (there will be some closed facebook groups for example if you start investigating) Otherwise, there are all the usual after school clubs and activities to get involvedwith (sport, craft, Beavers, music) if you feel you need to give him some organised structured activities.
Read as much as you can before you make a decision. There is a home educating section of Mumsnet too.
Ds2 has ASD, managed primary all right with a fair few issues along the way, I home educated him in secondary for two years, and realised how easy it would have been at primary.
If you don't feel up to home educating, consider the anxiety factor. What is the cause of the anxiety at school (most meltdowns are anxiety based, so privilege withdrawal really doesn't help or consequences), would a different school suit better, could you apply for an EHCP (ds2 has one now that he is back at school, it makes such a difference and allowed him to attend the right school for him)