You are on tenterhooks about the job offer.
OED
to be on (the) tenterhooks: i.e. in a state of painful suspense or impatience:
Worldwidewords.org explains further
It comes from one of the processes of making woollen cloth. After it
had been woven, the cloth still contained oil from the fleece, mixed
with dirt. It was cleaned in a fulling mill, but then it had to be
dried carefully or it would shrink and crease. So the lengths of wet
cloth were stretched on wooden frames, and left out in the open for
some time. This allowed them to dry and straightened their weave.
These frames were the tenters, and the tenter hooks were the metal
hooks used to fix the cloth to the frame. At one time, it would have
been common in manufacturing areas to see fields full of these frames
(older English maps sometimes marked an area as a tenter-field). So it
was not a huge leap of the imagination to think of somebody on
tenterhooks as being in an state of anxious suspense, stretched like
the cloth on the tenter.