1. Try 独りぼっち as a unit instead of 独り by itself.
2. The ~やしない ending is a more emphatic form of the negative, indicating one's conviction that <verb> ain't gonna happen. Not no way, not no how. さ is a sort of emphatic sentence ending.
3. The ちゃ is a combination ellision/contraction and if it were all there it would be いては. the て and the は combine into ちゃ and the い of いて gets dropped. The と has the same function as the と in such phrases as と言う.