(I swear it is) impossible for me to get rid of them;
(I am filled) with them, and (I will fill) them in return.
These two lines have three independent clauses. The first contains the subject (I) with the verb (swear) and the subject (it) with the verb (is). When connecting two independent clause without a conjunction, a semi-colon (;) must be used. The second independent clause has the subject (I) and the verb phrase (am filled). It is joined to the third independent clause with a comma and conjunction. The third independent clause has the subject (I) and the verb phrase (will fill).