I don't think the left side was your biggest problem. You only lost by 17.5 points, which you could probably have avoided with better endgame. My main advice is to play greedier and not defend so much. Precise endgame play is boring but simply playing tenuki a lot instead of defending would gain you at least 20 points in this game.
Some comments on the endgame:
Black 63 + 65: This is gote defence. Unless you are 100% sure you will die, you should tenuki. The value of an endgame move at this point is at least 6 points, probably a lot more.
Black 67: Tenuki. Gain 6 points
Black 75: The first line is worth less than the second line. Moves around e18 or m18 or r10 are bigger.
Move 83: Even if there is a problem here, using this move at e18 or m18 secures two eyes for your top group and your middle isn't going to die. Defend by making points when possible, gain 6 points.
Move 87: Big, but e18 is bigger because both players have open skirts there. Gain 3 points.
Move 89: Not needed. White can push for a couple of points but e18 is way bigger.
Move 91: Not needed, better at o18 or s12.
Move 93: Big, but I *still* wanna go e18 and make White respond to *me* for once.
Move 103: This cutting point is actually protected because of the
http://senseis.xmp.net/?ThirdLineCapture tesuji. You could have gained 6 points by playing at e18.
Move 105: m2 or e18 are bigger.
Move 109: e18 is bigger, and at the very least f16 is one point bigger. Greed is good.
Move 111: e18, e17 or tenuki are all bigger. Stop defending.
Move 113: Finally, but because of e17 this is gote now, so o18 is probably bigger
Move 119: o18 is bigger. 2nd line > 1st line
Move 125: Tenuki. Locally o16 is better.
Move 135: Small. m2 is big, p16 is worth -1 points now.
Move 141: Small, and could be at m6.
Move 145: If you had a real cutting point there he would have cut instead of playing l6 last move.
Move 151: Better at e11. Greed is good.
Move 153: Tenuki. If you are going to defend play at e11 or g14.
Move 155: Tenuki.
Move 163: Tenuki. If you insist on playing locally be greedier and play n15
Move 167: Not actually sente, for either of you. Tenuki and play e1.
Move 175: h2 is good shape if it's actually necessary. I'm don't think you need it.
Move 191: r2 would make the same shape you made at h2, securing an eye.
Move 193: Better at m1. You could tenuki except there's probably nothing bigger left.