I assume that by saying your fore stay has 'do turnbuckle' and you meant do'h or 'no turnbuckle' visible under the roller furling or what not of your boat?
Yes, you should use your halyards to secure your mast with the rest of the rigging and no, you should not have to release too much tension on your other stays/shrouds.
If your rig is keel steeped it is less important but still advisable. Deck mounted masts always require support from all quarters to stay up.
"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen
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