OK, so we're talking symptoms. Well, I have most of the common anxiety symptoms:

Sweaty palms.
(I, thankfully, don't profusely sweat, all that bad. As long as I keep my body temperature cool, I can avoid this embarrassing and unattractive problem. Sweaty palms, for me, is merely an annoyance.)

Uneven breathing.
(I often take shallow breaths, which is likely due to being anxious most, if not all, of the time; I think this is a big contributor to the worsening of my anxiety issues)

Heart palpitations.
(I get these a lot, and have done for at least 12 years, I'd say)

Unable to concentrate.
(for example, if I'm outside with a friend and they are talking to me, chances are, I'll struggle to concentrate on the conversation, for being too anxious and distracted with the noises, people, cars, etc)

Feeling agitated or jittery.
(thanks for reminding me of the jitteryness anxiety gives me, tealBumblebee, as I often shake my leg, tap my fingers, or fidget with something.)

Unable or unwilling to sleep.

Talking very fast, or slurred.

Pacing a lot.
(this is a bit of a contradiction, as I actually pace in order to use the energy, to battle the anxiety)

Twitches, shaking, and/or trembling.
(twitching has become a problem that I noticed, over the past few years, but I believe I have always been a trembler, due to the constant anxiety)

Digestive/bowel problems as a result of constant high anxiety.

Chest pains.
(usually on my left side, around the lung area, which fits the restrictive breathing symptom and seems normal)

Difficulty breathing.
(restriction and pain, if it's pretty bad)

Feeling hopeless - close to tears, watery eyes, or even, in very rare cases, actually crying.
(usually with a severe panic attack, with which I would feel very desperate)

Lethargy.
(this especially occurs after a particularly bad anxiety spike, or at the end of a very rough day.)

Desperation.
(I'm only listing this, because I believe in serious anxiety, it can be common to feel desperate. When I'm in this way, I can and have done things like, woken my parents up and insisted we went to the hospital in Oxford, because of things like chest pains, at 4am or something crazy like that. I've resorted to self-harm, alcohol, and then there's that thing that releases dopamine, hint hint)

Sexual dysfunction.
(this has caused problems in relationships and stuff; as long as I'm with someone whom I can trust and they are patient with me, then this isn't too severe an issue, but it does take time to knock down all those barriers the anxiety seems to put up, in order to feel that comfortable and relaxed)

Lack of appetite, or increased appetite.
(I believe that this is so, because, in the wild, if there were to be a tiger chasing you, you wouldn't stop for a sandwich, would you? But all the same, with the amount of anxiety I'm constantly going through, it's more demanding, I suppose. I need to make sure my body has energy and other things, in order to maintain such a ... level of alertness.)

There really are a myriad of other symptoms, but the above ones are all of which I have, in varying severity.

I've suffered with this crap, for probably 15 or more years. I'm now 27, and I doubt I'll ever be the normal I so desperately wish to be.