Lost lane and jungle won't/can't help, now what?
Now that I've climbed to silver I have actually been put against decent enemies. Whenever they win lane they zone me from cs and either freeze the lane so I can't do anything or push to my tower and roam or eventually take it down.
My question is, what do I do if something like this happens but my jungler can't help? Whether they got executed, invaded, busy helping other lanes, or they just refuse to help because they need farm, what do I do in a situation like this?
Most champions I get put against in mid/top can punish you heavily for attempting to cs, sometimes even under tower. Some examples would be

But as you can see, those are A LOT of champions that I have this problem with when going mid/top. The main ones are the champions with strong poke, or champions that will delete you the moment you get in range of their combo. Assassins like Akali or Fizz would definitely need to be fed to deny you from getting cs, because they are known to having a weak laning phase pre-6.
So in a losing lane, what do I do? I could just avoid being poked to death by losing almost all of my cs to my laner, or risk being poked to death by attempting to cs. If I roam to other lanes to attempt to help them they would push my turret, or roam to whichever lane I went to. Of course the average response would probably be: "Just prioritise to avoid dying and late game you can help in teamfights because your enemy laner won't be fed." I would agree with this except for the fact that I will be useless because I have gotten no gold. So it is a lose-lose scenario.
TL;Dr: If I am losing a lane against a champion that can easily deny me cs, and my jungler can't gank for whatever reason what would be the best thing to do? I would appreciate supportive answers instead of just "Don't lose lane and you won't have this problem."
In case this helps, my go-to picks would be
and sometimes 
and laugh as they can't combo the Minion down.
Any minions killed by it the gold goes right to you. I use this as a support to earn some extra sneaky cash.. xD
when I'm behind in lane. The GP10 and poke gold cannot be disregarded.
to sustain, and rush boots to roam faster than your opponent.
. These items help a lot, especially against assassins since the health and passives counter a lot of champion's burst combos. If they heal a lot get
. You are the Mid laner, so you are fully allowed to KS. If you simply cant for whatever reason get a kill and live (basically canon fodder), avoid kills altogether because you are worth significantly less when on a death streak if killed (sometimes as low as like 30 gold or so). Split push maybe with a
, from the smallest of leads.