shrub...you sound very down and upset about this. Firstly, this is a behavioural issue and not a nutritional one. And the behavioural aspects don't seem to be helped at all by the anxiety surrounding the feeding - in fact, it's making it worse and it's affecting the whole family.
The weaning window is rubbish, as Corrie says....forget about it.
My feeling is that to go away from him for a weekend would be very upsetting for both of you, and not worth the risk.
I think you need the chance to talk it over with someone who will listen to the whole story, right from birth and even before. There may well be other issues clouding the way forward.
Once this level of distrtess and anxiety are there, you can't win by trying to persuade the baby to eat. You need a different outlook.
There may be an eating clinic in your area, or else perhaps the HV supporting you could find out where you can get specialist help.
The other option would be simply to stop even trying to feed him solid food and just have it around at mealtimes, without 'getting him' to eat it or do anything with it. Breastfeed him ad lib, and then review in a month or so.
Good luck.