I'm an Industrial engineer - electronic\electrically biased - to say I'm disallusioned with industry is an understatement
Yep! Been there, done that, don't want any more of those s*****g tee shirts thankyou very much. I've been employed as an 'electronics design' engineer with more companies than I can remember. A couple of them were actually decent employers but they were temporary contracts. Others were mickey mouse outfits where you never knew which pay packet was going to be your last. One was a company of decent size with good pay and conditions but there was a snag. In all the years I worked there just about the only tool I ever picked up was a pen. Redundancy came as a breath of fresh air!
Have I described your predicament yet? Here's some other problems I encountered:
1) It's always easier to get a job if you already have one. Employers are suspicious of the unemployed.
2) It's b****y near impossible to get a job that pays less than the one you've got, no matter how well you could do it. I found myself in this trap when, unknown to me, one of those mickey mouse companies paid me way over the odds. They must have been desperate and of course I wasn't going to argue at the time.
3) Many public sector jobs have gone before they're advertized. The advert is a matter of procedure but they already know who's getting it. If you see a job with a very short closing date it's hardly worth filling in the application form.
Self employed or part of a firm? There was a time when this was a forgone conclusion; holiday pay, sick pay and pension scheme versus tax forms and bad debts. Now it's not so clear cut, especially in a small company. I suppose you either like being your own boss or you don't. Remember that you'll have to do all your own marketing, sales and accounts. In a word, paperwork. You might not have much time left for engineering!
I've had just two permanent jobs that I would recommend to anyone. The first was as a lab technician in a polytechnic; not well paid but a pleasant job with excellent terms of employment. The other is what I do now, fixing accelerators for the NHS; better pay than those mickey mouse companies and, despite what you may have read about the NHS, better working conditions too.
You already have the electronics experience so if you also know how many nucleons make helium you could do worse than look for a job in medical physics. There's supposed to be a shortage of electronics engineers and this has been confirmed by the standard of applicants for jobs here. They apply in their hundreds but very few can analyse a circuit diagram or even explain what inductance is.
The problem of course, as I know perfectly well, is that they DO apply in their hundreds and those few are a few more than you would like to have around. I even formulated the following rule: "It's not enough to be the best candidate. Everybody else must be useless." Just getting onto the short list is a major hurdle. I watched an application from one perfectly well qualified engineer go in the bin because he wrote, and I quote, "I am willing to move to Scotland if necessary." Sorry kidda but this is Geordieland!
Speaking from bitter experience you are in for a long slog of job applications, interviews and rejections but all I can say is stick it out. Persistence will eventually pay off.