GR translation: weights and probes of cranial pain that it seems could not be borne waking

[Mike Jing]

V238.11-16, P241.9-15   . . . he keeps his astral meathooks in as well as
can be expected, curled in the “sky” so tense with all the frustrations of
trying to reach across, with the impotence of certain dreamers who try to
wake or talk and cannot, who struggle against weights and probes of cranial
pain that it seems could not be borne waking, he waits, not necessarily for
the aimless entrances of boobs like Slothrop here—

In this phrase, does "of cranial pain" modify just "probes", or both
"weights and probes"?