Hi:
What could be wrong?
This can not truly be determined via the Internet (which has serious limitations/restrictions). One can only guess or speculate here.
"I am wondering if this could be early signs of anything serious."
Maybe, maybe not.
"Yesterday while relaxed, my lower left arm and hand went numb and I had a tingling rush to.....".
In general-only, tingling or numbness (paresthesias), has various causes, some minor to life-threatening, even including a side effect from some prescription drugs, or it can correlate with, or be triggered off by other symptoms (such as pain). Most common areas affected are the hands, arms, legs and feet, though it can occur anywhere on the body.
Additionally, of the various kinds/types of heart conditions, symptoms may/can be acute (occurring suddenly), be chronic (occurring over a long period of time), come and go (be transient, fleeting or episodic), or even be silent.
"a bit overweight / I am borderline diabetic"
Keep
ALL known modifiable risk factors for cardiovascular disease (which actually begins very early in life, even as early as in the pre-teen/teenage years) closely in-check.
Best of luck down the road of life. Live long and prosper.
Take care,
CardioStar*
WebMD member (since 8/99)
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Be well-informed
WebMD
Heart Disease TYPESMen and Women
Acquired in life or congenital
(born with it)http://www.webmd.com/heart-disease/heart-disease-men
Heart Disease SYMPTOMShttp://www.webmd.com/heart-disease/guide/heart-disease-symptoms Mayo Clinic
Heart DiseaseHeart disease is a
broad term used to describe a
range of diseases that affects your heart and sometimes the blood vessels......
http://www.mayoclinic.com/health/heart-disease/DS01120 LEARN ABOUT the

WebMD
The Heart: (Human Anatomy) Pictures, Definition, Location in the Body and Heart Problems
http://www.webmd.com/heart/picture-of-the-heart -
Good to know, for the primary and secondary prevention of heart attack and brain attack/
strokeEpidemiologic studies (EDS) have revealed risk factors (encompasses some new, novel or emerging) for atherosclerosis, typically affecting the carotid, coronary and peripheral arteries, which includes age, gender, genetics (gene deletion, malfunction or mutation) , diabetes (considered as being the highest risk factor), smoking (includes second and thirdhand), inactivity, obesity (a global epidemic, "globesity"), high blood pressure (hypertension), Low HDL (now questionable, according to recent studies) high LDL, small, dense LDL, RLP (remnant lipoprotein), high Lp(a), high ApoB, high Lp-PLA2, high triglycerides, HDL2b, high homocysteine (now questionable), and high C-reactive protein (CRP/hs-CRP).
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As applkicable to the patient
WebMD
Choosing a Weight-Loss Program
http://www.webmd.com/diet/guide/choosing-weight-loss-program The Diet Channel
http://www.thedietchannel.com - Quote!"Be a
questioning patient.
TALK to your doctor and
ASK questions. Studies show that patients who
ASK the most QUESTIONS, and are most ASSERTIVE, get the BEST results.
Be VIGILANT and
SPEAK up!"
- Charles Inlander, People's Medical Society
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It's your future......be there.

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WebMD/WebMD forums does not provide medical advice, diagnosis or treatment.