～てならないVery, Extremely, Can't help but do

Both express uncontrollable emotion. てならない is formal and written-style, as in 気になってならない (I can’t stop worrying). てしょうがない is common in speech, as in 会いたくてしょうがない (I can’t help wanting to see you).

Both suggest lack of control, but differ in usage. てならない expresses strong emotions welling up, as in 残念でならない (I can’t help but feel regret). ないわけにはいかない expresses unavoidable obligation, as in 約束したから行かないわけにはいかない (Since I promised, I can’t not go).

Both てならない and ざるを得ない convey inevitability, but differ in source. てならない expresses uncontrollable emotion or sensation, as in 会いたくてならない (I can’t help wanting to see them), while ざるを得ない indicates being forced to act due to circumstance or necessity, as in 行かざるを得ない (I have no choice but to go).

Both express strong feelings that continue naturally, but the nuance is different. てやまない is used for enduring, often positive feelings such as hope, respect, or wishes that persist over time, typically in written or formal contexts, as in 彼の幸せを祈ってやまない ('I continue to wish for his happiness.'). てならない expresses an intense feeling that arises uncontrollably at the moment, often emotional or physical, e.g. 不安でならない ('I cannot help feeling anxious.').

ことに and てならない both express emotional intensity, but differ in focus. ことに emphasizes the emotional tone of the situation itself, e.g. 悔しいことに、負けてしまった 'Regretfully, I lost.' てならない expresses a deeply felt, uncontrollable emotion, e.g. 心配でならない 'I can't help but worry.'

Both express uncontrollable actions or feelings, but differ in nuance. ずにはいられない is about being compelled to act (lit. 'unable not to act'), e.g. '彼を応援せずにはいられない' ('I can't help but root for him'). てならない emphasizes a state or feeling that overwhelms you, e.g. '暑くてならない' ('It's unbearably hot') or '会いたくてならない' ('I want to see you so much I can't bear it').

Both express strong emotions. てならない often implies natural, uncontrollable feelings and sounds formal, as in 心配でならない (I can’t help but worry). てたまらない emphasizes unbearable intensity, often colloquial, as in 会いたくてたまらない (I’m dying to see you).

Both convey extremity of feeling. Adj限りだ attaches to adjectives for maximum intensity, as in 嬉しい限りだ (I’m extremely happy). てならない attaches to adjectives or verbs for uncontrollable emotions, as in 不安でならない (I can’t help but feel uneasy).

Both describe situations that feel difficult or unpleasant, and can overlap in some usages. In particular, てはかなわない is used when a situation is practically unmanageable or intolerable, focusing on how an external condition makes normal life or work hard to continue, as in こんなに暑くてはかなわない (‘It’s so hot that I can’t deal with it.’). In contrast, てならない focuses on an internal, uncontrollable emotions, as in 会いたくてinternal, uncontrollable emotions, as in 会いたくてならない (‘I miss you so much I can't bear it.'). てはかなわない also sounds somewhat more formal.