Sorry to hear you feel that way.
Being passionate about a sporting team is a rough road. You get to experience some amazing highs, but then you've also got to suffer through some awful lows. Some teams have more of one or the other, and unfortunately ours is probably closer to the latter throughout our lifetimes.
I am invested in this team (and a couple of others...but not to the same degree as the Eels) and I ride the emotional rollercoaster like everyone else. Years ago I would be like how you are right now, taking every loss hard and being miserable for a week until we got to lose again so I could be miserable for another week.
Things have changed a bit for me these days. I still get sad over losses. I get cranky. I look for someone to blame. But I try to understand why it's happening and get on with my life until the next week. I've got a partner and two kids, I can't be cranky all day any more. Do I think Arthur should be replaced? Maybe, I don't know. But I do understand why he is still there. I don't think he's a bad coach at all, just maybe a little limited.
This season sucked, with only a few meagre highlights for us. Hopefully next year will be better. It may end in disaster again...but you know what? We've been there before, and come out the other side eventually. We arent the same club that finished last two years in a row just over a decade ago. Hopefully we never become them again.
All I know is that when we eventually do win the whole thing - and I do believe it will happen eventually - then it's going to be the best f**king feeling ever! And I'm not about to tap out and give up on that. I hope you don't as well.
Enjoy the off-season, mate.