No, no, no. Obviously there are different views on this subject, but if you're planning on following the Bible, then no, you cannot "lose" your salvation at all.
The "unforgivable sin" is rejecting the Holy Spirit. Therefore, the only way you can commit the unforgivable sin is to not be saved in the first place. It's only unforgivable because it is the act of refusing to ask for forgiveness. I hope this makes sense, because it's the only way I can think of to explain it.
There are several Biblical passages that indicate that one cannot lose his salvation.
John 10:27-29 My sheep hear my voice, and I know them, and they follow me:
[28] And I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of my hand.
[29] My Father, which gave them me, is greater than all; and no man is able to pluck them out of my Father's hand.
Romans 8:38-39 For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come,
[39] Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord.
John 6:37 All that the Father giveth me shall come to me; and him that cometh to me I will in no wise cast out.
Not to mention all the verses that contain the phrase "eternal life". It is impossible to keep from sinning even after we are saved. So why would God promise eternal life, if He was going to condemn anyone who sinned enough to lose their salvation, which is inevitably quite a few people? Christ died for ALL of our sins, long before any of them were committed. So why is it a stretch to assume that when you ask forgiveness for your sins, He forgives ALL of them?
Now, by no means does this mean "Go out and party, enjoy life, because Christ covered all of your sins and you don't have to worry about any of it". But you do need to get past the apprehension that you could be losing your salvation at any moment, because it's very detrimental to your walk with God. If you've accepted Christ as your Saviour and asked Him to pardon your sins, your saved, move on with your life, and don't look back on your old life. If you're having trouble, it doesn't mean you've lost your salvation. It just means you need to get your life straight and get closer to God. He'll be a much bigger help cleansing you from this kind of thing than any "professional". If you're going to trust Him a little bit, why not go the whole nine yards and trust Him to the fullest? It'll make your life alot easier.
