http://puu.sh/6ypMg.png <- when you're low and out of regen retreat to fountain, smoke and try to help mid

http://puu.sh/6ypQt.png <- you waved and stunned sk, 2 auto attacks and he would have died because he had no stout shield/armour. You have high armour you could have escaped from DP too.

http://puu.sh/6ypXV.png <- you bought boots way too late, VS has high armour early so if you're in a bad lane you can try boots and wand instead.

http://puu.sh/6yq2C.png <- with auto attacks, creep aggro and a wave you would have been able to kill SD. (my screenshot was a little late)

http://puu.sh/6yq7u.png <- you had excellent vision but your pudge didn't understand he should be ganking instead of pushing, smoke him and he might man up and follow you for a gank

http://puu.sh/6yq9Q.png <- again, you could kill with auto attacks (but run from his ulti or he could kill you)

After about this point majority of your job is done. You need to check their items more 'no stout->harrass, no boots->chase, no wand->dive' and you're shying from fights you can win