There seems to be some connection here i never realised before. In a way they are similar confessing a doom, uncertain and tragic turning of life. However in the chorus they do conclude in a different aspect of the same theme of "go on".
The first asking how its possible to continue struggle the second answring this is the only way.
Also the theme "go on" keeps on a repetitive form closing the tracks.
Plus they are both chosen as final tracks into two very different but "personal" albums. (the Overture Piccante in Barcelona dosent really count, its mostly a creative collage).
SMGO was written by Brian, not Freddie, so there must be a coincidence.
Also, when you look back and take a song from one context to another, you can create a lot of imaginary connections.
Too Much Love will Kill you may sound as some kind of warning from Brian and if you place it in Freddie's voice, it can sound as another connection to a certain "doom" but we all know the song is from the 80s, so there is no connection.
I agree with you in general BUT. The things you mention happen in a consious level. Brian consiously wrote the song about his divorse and his upcoming depression period at the time.However it is more than that i believe.These are the days is same case i believe. Originally written from Roger refleacting on life through his kids tc.But one can understand that the drive about writting such a song is more "multilayred" even if Roger wasnt conscious about it that time. To actually say that all Queen catalogue from 88 onwards is reflecting "doom" is oversimplifying. But when you have an issue of death running through the core of a creative quartet of course original ideas will be formed differentlly in process.
However what i was trying to say is although TSMGO is a very original and unique track (and my personal favourite) perhaps it borrowed a "go on" pattern (evident in How Can I go On) taking it to a coplete different level.And i am not talking about use of words. I am talking about an aesthetic seed around of wich a track takes shape.TSMGO of course uses more than one seeds/themes with the sad clown beeing the most evident.
Apart of all this, the theme of "going on" and "surviving" and "struggling" is very present in the Queen catalogue. From Keep Yourshelf Alive to Staying Power, Passing the Open Windows , Dont Try Soucide, Hung on in there, Dont try so hard. e.t.c. And its moslt Freddie and Brian that seem to dig deep into that concept even long before things started to get really serious.