To whom it may concern,
 
Regarding your question about the verb "feel," I have consulted several reference books. Please check the information listed below.
 
Practical English Usage, 3rd Edition, Michael Swan
1. link verb: I feel fine.
Feel can be used to talk about one's physcial or mental sensations. Adjectives or (in British English) noun complements are used. To talk about feelings that are going on at a particular moment, simple or progresisve forms can be used. There is little difference of meaning.
I feel fine. / I'm feeling fine.
How do you feel? / How are you feeling?
 
2. link verb: That feels nice!
Feel can also be used to say that something causes sensations. Progressive forms are not used.
That feels nice!
The glass felt cold against my lips.
 
Oxford, Advanced Learner's Dictionary
1. LINKING VERB to experience a particular feeling or emotion
˙She sounded more confident than she felt.
˙I was feeling guilty.
˙Luckily I was feeling in a good mood.
2. (not ususally used in the progressive tenses) to notice or beaware of something because it is touching you or having a physical effect on you
˙She could not feel her legs.
˙He felt a hand on his shoulder.
 
Cambridge Dictionary
feel verb
[L or T] to experience something physical or emotional
˙"How are you feeling?" "Not too bad, but I've still got a slight headache."
˙He's still feeling a bit weak after his operation.
˙My eyes feel really sore.
 
I hope that this information will be useful to you.
 
Regards,
San Min Book Co., Ltd. (Taiwan)
2010 / 10 / 27
www.sanmin.com.tw

PS: Thanks to the editor of San Min Book Co.