One shallow doesn't bring back spring

Or "ένα χελιδόνι δε φέρνει την άνοιξη".
The question is about which swallow am I talking about, cause theoretically speaking spring kicked in from March, actually, spring was the succession of autumn, no winter ever involved in the procedure. Since then every good or bad symptom of Spring and the forthcoming summer is here and inspire us or trouble us. So, allergies has taken the best out of me. My skin feels itchy, my eyes are swollen, and painful, lest not talk about the nose called waterfall. Pills do nothing anymore.
The other one is the Sun-that-burns-through-your-skin-and-boils-your-blood. The day-before (as in Greek προχθές, meaning a unspecified period in past-time) while working on the sewerage I got sunburned (sewage???). My grand-mother always told me that May's sun is the worst, but it was still April.
And the inspiring things, the drunken aroma from the lemon flowers, all kind of night flowers and jasmine (lemon flowers are long before gone). The promise of a great summer, with wine, in my yard, listening the silence of summer nights. A trip to Barcelona, and visiting our favorite Island, Syfnos. Summer love, summer wine, summer journey, summer beach...and of course HEAT.
But, where are the swallows??? Have you come across one? Do they still exist? I'm searching high and low for a sign, something, but nothing is there. I'm really disappointed. I only hear the morning chattering of sparrows, but no shallows. I'm missing them, building their nests at the corners of balconies, feeding their nestlings. Not good, not good at all.

P.S. Everything was different this year, birds where preparing for their migrating trips not in September but in January. Deciduous never lose their leaves. Draught is at the gates.
Recent news state that Italy entered in emergency state as Pados, Italy's largest river, started to shrink.