sblood
Shortened from God's blood. In medieval times, people would curse on God's body parts rather than breaking the third commandment (Do not use the Lord's name in vain oaths). In this case, the exclamation refers to Christ's blood shed during the crucifixion and commemorated by the drinking of wine during communion.
http://en.wiktionary.org/wiki/'sblood

'ounds
Abbreviation of God's wounds, with reference to Christ's wounds before the crucifixion
http://en.wiktionary.org/wiki/zounds