Iʻm Thinking a word that Rhymes with "Schismatic"

Rhyming with "schismatic", it may or may not itself be a 3-syllable word.

I've got this pain in my back, and its shooting down my leg!

Itʻs annoying, but itʻs not
"Sciatic"*.

*nor
sciaticA"

I wouldn't want to be one of these people who goes overboard about something, like the Phillies' mascot.

Nonetheless, I think that you should feel very, very sorry for me :-(

4: Baseball fan, but not Phillies "fanatic(?)" --unless
theyʻre playing the Yankees0 in the World Series.

5. sounds like I should be
"sympathAtic" -- I mean "sympathEtilc".

Is it to do with a three dimentional triangle?

I'm trying to stretch and stretch.

Iʻd expect (7) to end in "-oid" or "-us"; but I donʻt know exactly what it is. I didnʻt get beyond 1st Year (Plane) Geometry in school. (7)

Hoping that the rhyme isnʻt "a stretch", I donʻt get what 8 is.

#8 I hope my underwear stays up!

Sacerdotal? Or related to an Egyptian form of writing? (one word, two meanings. or is it two words, spelled the same?)

Brother, can you spare a 1955 doubled-die cent?

11>

I was thinking of giving a hint concerning the structure of
"Hieratic" (which I take to be 11ʻs Guess). Then I figured, "No, --too much of a give-away."

12:

I didnʻt even know there were "off-color"coins in 1955;
I thought that was back in
the 1940s, the war years -- "steel" rather than copper, pennies which didnʻt stay brown in color.

I'm trying to tune in, but I keep getting this white noise.

Not "static" --which I suppose can be an adjective, though usually a noun; Iʻll
hint that the Crambo! Word is an adjective.

How about I just go with the flow? My last word began with a 'p' too.

In politics, a supposed pragmatism is discussed a lot; but Iʻm not convinced that the "pragmatic"
politician does no more than "go with the flow"; so I forward "pragmATIC" for
17, very tentatively.
But itʻs not the Crambo! Word.

If the 'matic' by itself is the only bit that needs to rhyme how about those aches and pains that oldies like me get from time to time?

19:
THe Crambo! Word kind of behavior can cause pain, but itʻs
Neither "rheumatic" nor the
(already guessed?) "sciatic"
(2>3)

(Channels Dion) They call me the wanderer, yeah, wanderer, I roam round and round and round and round (but in the geological, not the rock, sense!)

Canʻt think of an "-atic" ending "wanderer"; but I will admit that the {Crambo! Word is an "-atic" -- not only in rhyme, but in spelling.

#21 Also irregular and unpredictable.

21, 23:

Right, rodney vc!
Please take over.

(I should have gotten it from 21 -- from
my Latin knowledge -- since
"Errare" = "wander" ;as in "wanderer" (21).)

#24 That's a surprise! Good game, Roland. A new round inspired by you starts over here.

#6 I was just trying to be pathetic! I suspect #7 may have been prismatic. #8 was elastic. Was #12 numismatic?

"Elastic" I should have gotten. "Prismatic" and "Numismatic" I didnʻt think of; (I was looking for something more specifically descriptive of a coin) but probably youʻre right.

Forgive me for being dense but what was the word?

". . .what was the word (27) (not my idea of a "dense" question)

"erratic".

(Guessed in #21, but I didnʻt get it, until "irregular" and "unpredictable" were said in #23.)

Aha! Thank you!