Shin Splints? Desperate for advice

Hey!

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I am training to run a marathon this upcoming October with some friends. I use to run cross country back in highschool and have been fairly athletic in the years since I'm a 25 yr old male.

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I started 'training' slowly just building up my endurance and mile time back in April and then had to take a break for a few weeks due to an arm surgery.

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Ever since I have been back on it I am getting HORRIBLE pain in my shins, the first time it happened I took like 8 days off until there was no pain at all and my next run was fine ( 2.5 miles ) and then two days later I got a mile in and I had to walk / drag my self home from the pain. It's been a few weeks now where I am hardly running due to the pain or fear of the pain.

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After the first time it hurt I started stretching consistently, doing preventative shin split exercises, drinking loads of water, and just last week I bought a new pair of running shoes ( as I was told this may be the problem ) and got the cloud monster 3 on pair.

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The marathon isn't until October 4th so I am hoping there is still time to recover from whatever this is and still train to run the marathon. ( I have no goal other than crossing the line whether that take me 4 hours or 6+ )

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Any advice would be super appreciated of stretches to do, if I need to take a break for however long, see a doctor ( and what kind ) or what the hell to do. -- just got back from a mile long run where I now feel like my shins are broken are going to kill me --