Its impossible to maintain a positive attitude anymore

As of right now, I'm about to lose out of silver I for what I think is probably my 9th or 10th time this season. Now, I'd be okay with this if I had played poorly and didn't have the mmr to stay, but in most, if not all, of these demotions I'll win my series into silver I and then the games I play immediately after have AFKs, trolls, or just team mates that don't seem to belong where I'm playing at. I'm not saying I deserve some rank or other, but what I desperately want is a fair chance to stay in Silver I and perhaps make it to gold and I honestly don't feel like I'm getting that since this KEEPS HAPPENING. Its hard to maintain a positive attitude when it feels like riot has decided that I may not advance further than silver I this season and matches me with the mid laner that thinks they are god and afks after giving first blood, or I just get unlucky and my mid laner doesn't connect all game(and still no AFK compensation by the way). I still really enjoy ranked, but how am I supposed to stay cheery when bot goes 0-5 in 10 minutes and I know I'm heading straight back into the rut I've been in all season? Has anyone got any tips for dealing with afks, trolls, poorly playing team mates or for trying to stay positive while I try to save enough money for the chemotherapy that I'll inevitably need after playing ranked?