I am loosing all my layers effects when I merge all the layers together to save the image in the tif format! How to avoid this lost? Can someone help me? this is very urgent! I have to give the file to the printer for my solo exhibition on tomorrow morning and I am turning and turning to find a solution but can't!!!Thank you very much in advance.
You are probably not losing your layer effects.
It's likely you think you are because the preview display, when zoomed-out, is only a rough facsimile of the actual effects.
Chances are if you zoom to 100% then flatten/merge your image you'll find that the layer styles are preserved perfectly.
You may have to adjust the sizes/amounts of the layer styles to make them appear as you want.