Yes, I saw the post above tonight ( actually this morning since it's 12:30 a.m. now

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It's always a sad thing to lose a pet you've had for so long. The only real solace is that you did have her for so long. Nothing lives forever so the best you can do is keep them for their natural lives. I can't address your guilt because I only know about the last 1/10th of the conversation. All I can say about the idea of guilt is that whatever you do or did to feel guilty about, don't do it again because you can't change the past, you can only change the present which can affect the future.
As for your future with fish keeping, you still do have the other 2 or 3 fish. ( 3 assuming you still have the parrot.) They need care and maintenance but here's the thing, they too will not live forever so you are going to go through this again sometime in the future ( near or not too far) and only you know how well you are going to handle it. I suggest that if you can't handle it, rehome them so that they can live out their lives as best they can. Then, shut the tanks down and if you can, store them somewhere so that you have the option at a later date to come back to the hobby if you choose to. Here's what know about the fish hobby: it gets into your blood. You sometimes pass a pet store and can't help but walk in for no other reason than to reminisce about your former fish. Some time may go by and you think about going back to that store or another pet store " just to look". Then before you know it, you are thinking " I want fish again." For me, I took an almost 20 year break from fish keeping at home after I lost my hatchery to a new disease. I was devastated to say the least. What I didn't do was stay away from the hobby, I just didn't have fish at home. So I never really left the hobby, I just did it from afar in stores and warehouses. And don't ya know, one day, I got a call from a friend asking me to start breeding fish again for him and all those tanks I stored, made it inexpensive to get back into the whole operation again. It took that flicker and made it a flame.

I still have some of those tanks and they are now 40-50 years old and still hold water so I can start 'em up in a heartbeat.

But that's just my story. Take a look around here on AA at a number of the newest members whose introduction pages say " I'm getting back into the hobby". See, it gets into your blood and you have no control.

So you always have the option to sell your tanks and your equipment but like after any loss of a pet or person, don't make any rash decisions. Give yourself a chance to heal from the loss then decide. In the meantime, make sure you maintain the fish tanks as you should only don't spend too much time in front of them. Feed the fish and walk away. Do your water changes and walk away OR, hire a maintenance company to do the maintenance and just feed the fish. See how you feel not spending a lot of time with the fish. That can help you decide.
As for bumpy, unless you hire someone to come in and take care of the fish, you are going to see the decline and eventual death. It often happens more at night but it can happen at any time. There's no getting around it unless you euthanize. Hopefully it will end for you and her swiftly.

That's the best I can tell you.